Question

我正在尝试制作一个包含一些文本输入，选择输入和日期输入的表单，其中一些输入是可选的。所以，如果有人将这些输入留空并提交，我想要＆＃34; NULL＆＃34;要输入mysql数据库而不是＆＃39; ＆＃39;

以下是我尝试的代码的一部分：

   <?php

 $con = mysqli_connect('localhost','root','abcdef','trademarkfilingproject');

error_reporting(1);


 $Preference2 = 'Null';

 if(!$con)
    { 
        echo "Not Connected To Server";
    }
 else{

    $Department = $_POST['department'];
    $Classs = $_POST['classs'];
    $Preference1 = $_POST['preference1'];

    function replaceWithNull(&$Preference2)
    {
    if (empty($Preference2) || $Preference2 == ' ') {
        $Preference2 = "NULL";
    }  
    }
    array_walk($_POST, "replaceWithNull");


    $Preference3 = '';
    $Preference4 = '';
    $Preference5 ='';
    $Goods = $_POST['goodsnservice'];
    $Mark = $_POST['mark'];
    $MarkYesWhen = $_POST['yeswhen'];
    $MarkYesCountry = $_POST['yescountry'];
    $MarkNoWhen = ''; 
    $MarkNoCountry = ''; 
    $MarkAppliedCountry = $_POST['markappliedcountry'];

    //echo $_POST['prefer1'];  

    //print_r($_POST['yescountry']); die();


$sql = "INSERT INTO requestor (Department,Class,Preference_One,Preference_Two,Preference_Three,Preference_Four,Preference_Five,Goods_Services,Mark_In_Use,Mark_Yes_When,Mark_Yes_Country,Mark_No_When,Mark_No_Country,Mark_Applied_Country) VALUES('$Department','$Classs','$Preference1','$Preference2','$Preference3','$Preference4','$Preference5','$Goods','$Mark','$MarkYesWhen','$MarkYesCountry','$MarkNoWhen','$MarkNoCountry','$MarkAppliedCountry')";
$r = mysqli_query($con,$sql);

header("refresh:1 ; url=success.html");

 }
?>

如果我使用上面的代码，首选项2得到＆＃34; NULL＆＃34;如果是空的但是，如果输入不是空白，我正在尝试使用以下代码：

function replaceWithNull(&$Preference2)
    {
    if (empty($Preference2) || $Preference2 == ' ') {
        $Preference2 = "NULL";
    }
        else {
            $Preference2 = $_POST['preference2'];
        }

    }
    array_walk($_POST, "replaceWithNull");

以下是我的HTML代码：

<!DOCTYPE html>
<html>
<head>
<link rel="icon" href="\images\trademark_icon.png" type="image/gif" sizes="16x16">


</head>
<style>

.error {color: #FF0000;}


#markyes {
    display: none;
    padding: 10px;
    background-color: #f2f2f2;
}

#markno {
    display: none;
    padding: 10px;
    background-color: #f2f2f2;
}

input[value="yes"]:checked ~ #markyes {
    display: block;
}

input[value="no"]:checked ~ #markno {
    display: block;
}


input[type=text], select {
    width: 90%;
    padding: 12px 20px;
    margin: 8px 0;
    display: inline-block;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}


input[type=submit] {
    width: 100%;
    background-color: #4CAF50;
    color: white;
    padding: 14px 20px;
    margin: 8px 0;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}


input[type=button] {
    width: 10%;
    color: black;
    padding: 10px 15px;
    margin: 8px 0;
    outline: 2px black;
    border-radius: 4px;
    cursor: pointer;
}

input[type=submit]:hover {
    background-color: #45a049;
}

div {
    border-radius: 5px;
    background-color: #f2f2f2;
    padding: 10px 40px;
}

body{
background-image: url("images/bg-01.jpg");
background-repeat:repeat;
z-index:1;
}

.form-title {
  display: block;
  width: 100%;
  font-size: 30px;
  color: white;
  text-transform: uppercase;
  text-align: center;
  margin:auto;
  padding:50;
}

.herologo {
    hight:70px; 
    width:60px;
    background-position: top-left;
    float:left;
}
</style>
<body>

<h2 ><img src="images/hero_logo.png" class="herologo" ><span class="form-title">Trademark Filing Application</span></h2><br>

<div>
<p style="padding-left:20px"><span class="error">* required field.</span></p>

  <form action="insert.php" method="post" enctype="multipart/form-data">

    <!-- Department  -->

    <b>Select Department:</b><span class="error"> *</span>
    <select id="dept" name="department" required>
    <option value="">Please Select...</option>
      <option value="ceo">CEO Office</option>
      <option value="global">Global</option>
      <option value="marketing">Marketing</option>
      <option value="parts">Parts</option>

    </select>
    <br><br><br>

    <!-- Class  -->

    <b>Select Class:</b><span class="error"> *</span><br><br>
    <input type="radio" id="wordradio" name="classs" value="Word" required>Word
    <input type="radio" id="deviceradio" name="classs" value="Device" style="margin-left:20px">Device
    <input type="radio" id="logoradio" name="classs" value="Logo" style="margin-left:20px">Logo
    <input type="radio" id="soundradio" name="classs" value="Sound" style="margin-left:20px">Sound
    <input type="radio" id="taglineradio" name="classs" value="Tagline" style="margin-left:20px">Tagline
    <br><br><br>


    <!-- Preferences  -->


    <b>Enter Preference(s):</b><br>
    1. <input type="text" id="pref1" name="preference1" style="width:30%" placeholder="Preference 1" required>
    <input type="file" id="prefbtn1" name="files[]" multiple="" required>
    <span class="error">*</span>
    <br>

    2. <input type="text" id="pref2" name="preference2" style="width:30%" placeholder="Preference 2">
    <input type="file" id="prefbtn2" name="files[]" multiple="" >

    <br>
    3. <input type="text" id="pref3" name="preference3" style="width:30%" placeholder="Preference 3">
    <input type="file" id="prefbtn3" name="files[]" multiple="" >

    <br>
    4. <input type="text" id="pref4" name="preference4" style="width:30%" placeholder="Preference 4">
    <input type="file" id="prefbtn4" name="files[]" multiple="" >

    <br>
    5. <input type="text" id="pref5" name="preference5" style="width:30%" placeholder="Preference 5">
    <input type="file" id="prefbtn5" name="files[]" multiple="" >

    <br><br><br>


    <!-- Goods and Services  -->


    <b>Enter The Types of Goods & Services :</b><span class="error"> *</span>
    <br>
    <input type="text" id="goodss" name="goodsnservice" placeholder="Select the type of Goods and Services" required>

    <br><br><br>


    <!-- Mark in Use?  -->

   <b>Is Mark In Use?</b><span class="error"> *</span><br><br>
    <input type="radio" id="marky" name="mark" value="yes" onclick="disableNo()" required>Yes


    <!-- Mark in Use?: YES  -->


    <div id="markyes" class="show-hide" style="background-color:white;width:600px ;margin-left:40px; border:1px solid black; border-radius:5px"><br>
    <b>When Did You Use It?</b>
    <input type="date" name="yeswhen" style="margin-left:10px" id="markyesdate" required><span class="error"> *</span><br><br>

    <b>Where Did You Use It?</b><span class="error"> *</span><br>
    <select name="yescountry[]" style="width:20%" id="markyescountry" multiple required>
        <option value="Afghanistan">Afghanistan</option>
             ...
        <option value="Zimbabwe">Zimbabwe</option>
        </select><br><br>

            <b>Proof Of First Use:</b><span class="error"> *</span><br>
    <input type="file" id="markyesproof" name="files[]" value="Upload one or more files" multiple="" required>
    </div><br>


            <!-- Mark in Use?: NO  -->


    <input type="radio" name="mark" value="no" onclick="disableYes()" >No<br>
    <div id="markno" class="show-hide" style="background-color:white;width:600px ;margin-left:40px; border:1px solid black; border-radius:5px"><br>
    <b>When Are You Expected To Use It?</b>
    <input type="date" name="nowhen" style="margin-left:10px" id="marknodate" required><span class="error"> *</span><br><br>

    <b>Where will You Use It?</b><span class="error"> *</span><br>
    <select name="nocountry[]" style="width:20%" id="marknocountry" multiple required>
        <option value="Afghanistan">Afghanistan</option>
          ...
        <option value="Zimbabwe">Zimbabwe</option>
        </select><br><br>

    </div><br>


            <!-- Mark Applied Country  -->


    <b style="text-height:50%">Mark Applied Country:</b><br>
    <select name="markappliedcountry[]" style="width:20%" multiple >
        <option value="Afghanistan">Afghanistan</option>
         ...
        <option value="Zimbabwe">Zimbabwe</option>
        </select><br><br>

    <br><br><br>

    <input type="submit" value="Submit">
  </form>
</div>

<script>
function disableNo() {
    document.getElementById("marknocountry").required = false; 
    document.getElementById("marknodate").required = false;      
}

function disableYes() {
    document.getElementById("markyescountry").required = false; 
    document.getElementById("markyesdate").required = false;
    document.getElementById("markyesproof").required = false;       
}
</script>


</body>
</html>

Answer 1

使用"'NULL'"代替"NULL"。这将在所需位置插入"NULL"字符串。基本上$Preference2 = "NULL";应为$Preference2 = "'NULL'";

你在做什么是这样的：

insert into myTb (val) values (NULL);

你应该做的是：

insert into myTb (val) values ('NULL');

用＆＃34; NULL替换空格＆＃34;串

1 个答案: